Rock-drill lubrication.



J. A. THOMPSON L E. M. MACKIE. ROCK DRILL LUBRIGATION.

APPLIUATION FILED Nov.z2,19oe.

91 1, 180. Patented Feb. 2, 1909.

UNITED STATES PATENT OFFICE.

.IAMES A. THOMPSON AND EDWIN M. MACKIE, OF CHICAGO, ILLINOIS, ASSIGNORS TO CHICAGO PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

ROCK-DRILL LUBRICATION.

Specification of Letters Patent.

I Patented Feb. 2, 1909.

To all whom 'it 'may concern:

Be it known that we, JAMES A. THOMPSON and EDWIN M. MACKIE, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Im rovements in Rock-Drills, of which the fol owing is a specification.

Our invention relates to rock drills and the object thereof is to provide novel and efficient means for automatically lubricating the different workin parts thereof.

In the drawings, igure 1 is a central longitudinal section of a rock drill embodying our invention, and Fig. 2 a plan view of the valve seat on an enlarged scale as compared with Fig. 1, and showing a part of the valve seat in section.

Referring to the present embodiment of our inventlon, as shown applied to a rock drill, the same consists in providing automatic means which is here located in the valve seat of the rock drill for lubricating the parts of the drill in an efficient and automatic manner.

Inasmuch as a rock drill is so well known, and as our invention does not modify the construction of the well known arts, a detailed description of the rock dril will be unnecessary. It will suffice to say that the cylinder 1 of the rock drill is provided with the usual rocker 2, which actuates the valve 3 located in the valve casing or chest 4. This valve slides u on the upper face ofthe valve seat 5, which contains the ports and passages leading to and from the cylinder of the rock drill for actuating the usual piston 6 therein. The fluid pressure enters the valve casing or chest through the passage 7 and is then distributed or governed by the valve 3, such valve in one position (as seen in Fig. 1) permitting the live pressure to enter from the valve chest to the rear end of the cylinder through the port and passa e 8 and in the opposite position admittin ive pressure to the other end of the cy inder through the port and passage 9, it being understood, moreover, that the valve seat is provided at its central portion with the usual exhaust passages indicated at 10.

In one end of the valve seat 5 is formed a chamber 11, which is provided with a small passage 12 leading from such chamber into a recess 13 at one end of the valve seat and immediately adjacent the inlet port and passage 8, but separated therefrom by the portion or bridge 14. This chamber 11 is arranged to contain the lubricating oil and to also contain a wick 15 which is passed through said opening 12 so as to project slightly into the recess 13 in the valve seat, with the result that the pulsations of the fluid pressure acting upon the exposed end of the Wick will take up the lubricating oil from the wick, to Whose inner end such oil has been carried by capillary attraction, and by the influence of the pulsations ofthe fluid fessure. The fluid pressure will thereupon ecome laden with the lubricating oil thus atomized and will carry the same to the working and moving parts of the rock drill and thereby lubricate them. It will be understood that by reason of the construction of the valve and valve seat with the recess 13, the iiuid pressure is compelled to pass by and over the exposed end of the wick for the purpose of taking up and atomizing the oil before it can be permitted to enter the inlet port and passage 8. i

To provide access to the oil chamber 11 and to permit the same to be lled with oil, a coupling 16 is screwed into one end thereof and rovided with an elbow connection 17, whic is itself closed by a screw plug 18. By preference and as illustrated in the drawing, we prefer to provide the outer end of the wick at a point where it passes through the opening 12, with a piece of wire gauze 19. By means of this gauze the wick is retained in lace, and prevented from being blown bac or out of lace by the fluid pressure to which such wie is exposed, as described.

We claim:

1. Lubricating means for rock drills comprising, in combination with the casing of such drill provided with a space for the Hood of fluid pressure, a lubricating oil chamber having a port communicating with said space, and a wick arranged in said chamber and port for conducting the oil and presenting andV exposing it to the action of the fluid lpressure whereby the oil is atomized and eld in suspension in the fluid pressure and eventually fed to the working parts with which the fluid pressure comes into contact.

2. In a rock drill, the combination, with the distributing valve and valve seat thereof, of a chamber on the valve seat adapted to contain lubricating oil, and a Wick leading from said chamber towards the valve seat in position to permit the Huid pressure to pass across its exposed end and to take u oil therefrom and to cause the oil to be fed by the pulsations of such pressure.

3. In a rock drill, the combination, With the distributing valve and Valve seat thereof, said Valve seat having a recess 13 and a chamber 11 at one end to contain lubricating oil, and a Wick l5 leading therefrom to said recess and exposed at its end to the Huid pressure in its passage to the drill cylinder.

4. In a rock drill, the combination, with ELMA A. KENEL, PERCIVAL F. DoYLE. 

